基于双层扇形基片集成波导的双频平衡滤波器

提出了一种表面刻有一对互补开环谐振器(CSRR)的45°扇形基片集成波导谐振腔(SSIWR),设计并制作了一款结构紧凑且具有高选择性的双层双频平衡带通滤波器.分别利用具有带通特性的CSRR和谐振腔内的TM220模实现了差模双频响应;模式间的耦合以及缺陷地结构(DGS)的引入使得滤波器在通带附近产生4个传输零点,提高了带...

Dual band Balanced Filter Based on Double layer Sector Substrate Integrated Waveguide

A 45°sector substrate integrated waveguide resonator (SSIWR) with a pair of complementary split ring resonators (CSRR) etched on the surface was proposed. A compact double layer dual band balanced bandpass filter with high frequency selectivity was designed and fabricated. The differential mode dual band response is realized by using the CSRR with bandpass characteristic and the TM220 mode in the cavity respectively. The coupling between modes and the introduction of defective ground structure (DGS) made the filter produce four transmission zeros near the passband, which improves the out of band rejection. In addition, good common mode suppression has been achieved through the balanced structure and optimized feeding positions. The center frequency of the filter is 10.13 GHz and 10.83 GHz, the -3 dB bandwidth is 140 MHz and 150 MHz, and the common mode suppression in the two passbands exceeds 30.36 dB and 29.87 dB, respectively. The measured results are basically consistent with the simulated ones.